Definition of cotylosaurian in English:

cotylosaurian

Pronunciation /kəˌtʌɪləˈsɔːrɪən/

adjective

  • Belonging to, characteristic of, or designating the order Cotylosauria of extinct reptiles.

noun

rare
  • A reptile of the order Cotylosauria ; a cotylosaur.

Origin

Late 19th century; earliest use found in Transactions of the American Philosophical Society. From scientific Latin Cotylosauria, order name + -an.